Explosive engine piston



June 17, 1930. Q SPENCER I 1,763,993

EXPLOSIVE ENGINE PISTON Filed March 21, 1929 I I nvcn tor Patented June 17, 1930 OWEN H. SPENCER, OF INDIANAPOLIS, :ZNDIANA EXPLOSIVE ENGINE PISTON Application filed March 21, 1329. Serial No. 348,908.

This invention relates to pistons of that class adapted primarily for use with ported explosive engines, and one feature of the invention is in so constructing the upper end of the piston that it will serve to control ports for the admission of fuel or air and the expulsion of exhaust.

A further feature of the invention is in so arranging the upper end of the piston that the exhaust will be gradually gathered and conveyed towards and exhaust port.

A further feature of the invention is the provision of means for first directing the fuel entering the engine in an upward direction and then gradually directing the same against the exhaust with a flowing action.

A further feature of the invention is the provision of means for distributing the fuel or the like laterally as well as upwardly.

Other objects and advantages will be hereinafter more fully set forth and pointed out in the accompanying specification.

In the accompanying drawing which is made a part of this application,

Figure 1 is a side elevation of a piston.

Figure 2 is a top plan view thereof, inclicating a cylinder therearound in dotted lines.

Figure 3 is a sectional View as seen along line 33, Fig. 2, and

Figure is a sectional view as seen along line 4-4, Fig. 2.

' Referring to the drawing, the numeral 1 indicates the body of the piston, such as is commonly used in ported engines such as a two cycle engine, the upper end of the piston having a baffle 2 formed thereon. The baffle 2 consists of a ridge 3, the central portion of which is curved substantially concentric to the curvature of the piston, and sets inward from the edge of the piston, while the ends 4 of the ridge are reversely curved and terminate substantially flush with the peripheral edge of the piston and substantially along a transverse line thereof. The face 5 of the ridge 3 is so curved at its lower portion that it gradually flares into the piston proper, so that fuel or other particles striking thereagainst will be directed upwardly.

At the opposite side of the ridge 3, the top surface of the battle 2 gradually curves downwardly and inwardly to form a valley 6, so that particles passing thereover will tend to move towards the center of the baffle and the volume thereof discharge about a given point 7, which point is directly in line with an exhaust port 8 of a cylinder 9, see Fig. 2.

To further gather the exhaust, as well as any foreign particles that may gather over the battle 2, a slight oval swell 10 is extended substantially in a straight line from-each end of the ridge 3 to the flat edge of the piston immediately opposite the center of the exhaust port 8, such slight swell retarding the natural tendency of the volume of exhaust to pass to the extreme edge of the piston.

ny curving the ridge 3 in substantially ogee formation, the product entering thru the intake port 11 of the cylinder, is directed laterally towards each end of the ridge aswell i as upwardly. Itwill likewise be seen that as the product entering thru the intake port 11 strikes against the exhaust products within, the cylinder, the tendency of the entering product is to pass over the ridge 3 with a rolling action, carrying the exhaust matter before it, and as the force of the exhaust is downward, it will be gathered towards a common center in the valley 6 and carried directly to the exhaust port 8, the swells 1O acting in conjunction with the curved face of the valley 6 for concentrating the exhaust and any foreign particles that may be on the face of the battle. I

The valley 6 and the swells 10 are conveniently determined by imaginary lines passing from points along the upper adjacent edge of the ridge 3 thru the point 7.

While the description and drawings illustrate in a general way certain instrumentalities which may be employed in carrying the invention into effect, it is evident that many modifications may be madein the various details without departing from the scope of the appended claim, it being understood that the invention is not restricted to the particular examples herein described.

I claim as-my invention:

In a piston structure, a baffle at the upper end of the piston comprising a substantially ogee shaped ridge extending from side to side of the piston, a Valley formed on one side of said ridge, and oval swells at the discharge end of the valley.

In testimony whereof, I have-hereunto set my hand on this the 10th day 0f March,

1 ,VOWQEN H. SPENCER, 

